The PCB 1 wherein the first material is positioned along {HEAD ~ opposed sides} of {TAIL ~ the second material} 
of
The PCB 1 wherein the first material is positioned along { HEAD ~ opposed sides } of { TAIL ~ the second material }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL