An emitter and {HEAD ~ an extrinsic base layer} are formed in respective contacting relationships with the first and second portions of {TAIL ~ the intrinsic base layer} 
An emitter and { HEAD ~ an extrinsic base layer } are formed in respective contacting relationships with the first and second portions of { TAIL ~ the intrinsic base layer }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL