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