An emitter is in {HEAD ~ a contacting relationship} with {TAIL ~ 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 
with
An emitter is in { HEAD ~ a contacting relationship } with { TAIL ~ 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
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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