def getTrafficItemPktHeaderStackObj(self, configElementObj=None, trafficItemName=None, packetHeaderName=None):
        """
        Description
           Get the Traffic Item packet header stack object based on the displayName.
           To get the displayName, you could call this function: self.showTrafficItemPacketStack(configElementObj)

           For this function, you could either pass in a configElement object or the Traffic Item name.
           
        Parameters
           configElementObj: <str>: Optional: The configElement object.
                             Example: /api/v1/sessions/1/ixnetwork/traffic/trafficItem/1/configElement/1

           trafficItemName: <str>: Optional: The Traffic Item name.

           packetHeaderName: <str>: Mandatory: The packet header name.
                             Example: ethernet II, mpls, ipv4, ...

        Return
           The stack object
        """
        if configElementObj == None:
            # Expect user to pass in the Traffic Item name if user did not pass in a configElement object.
            queryData = {'from': '/traffic',
                         'nodes': [{'node': 'trafficItem', 'properties': ['name'],
                                    'where': [{'property': 'name', 'regex': trafficItemName}]}]}

            queryResponse = self.ixnObj.query(data=queryData)

            if queryResponse.json()['result'][0]['trafficItem'] == []:
                raise IxNetRestApiException('\nNo such Traffic Item name found: %s' % trafficItemName)
                
            trafficItemObj = queryResponse.json()['result'][0]['trafficItem'][0]['href']
            configElementObj = trafficItemObj+'/configElement/1'
        
        response = self.ixnObj.get(self.ixnObj.httpHeader+configElementObj+'/stack')

        for eachStack in response.json():
            currentStackDisplayName = eachStack['displayName'].strip()
            self.ixnObj.logInfo('Packet header name: {0}'.format(currentStackDisplayName), timestamp=False)
            if bool(re.match('^{0}$'.format(packetHeaderName), currentStackDisplayName, re.I)):
                self.ixnObj.logInfo('\nstack: {0}: {1}'.format(eachStack, currentStackDisplayName), timestamp=False)
                stackObj = eachStack['links'][0]['href']
                return stackObj
        
        raise IxNetRestApiException('\nError: No such stack name found. Verify stack name existence and spelling: %s' % packetHeaderName)