stacking a second adhesive, which is {HEAD ~ a thermoplastic epoxy resin}, on {TAIL ~ the first adhesive} 
stacking a second adhesive , which is { HEAD ~ a thermoplastic epoxy resin } , on { TAIL ~ the first adhesive }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL