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