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