{HEAD ~ An emitter} is in {TAIL ~ a contacting relationship} with the first portion of the intrinsic base layer, and an extrinsic base layer is in a contacting relationship with the second portion of the intrinsic base layer 
{ HEAD ~ An emitter } is in { TAIL ~ a contacting relationship } with the first portion of the intrinsic base layer , and an extrinsic base layer is in a contacting relationship with the second portion of the intrinsic base layer
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH