As {TAIL ~ a consequence} of the masking, the second portion of the intrinsic base layer is thinner than {HEAD ~ the first portion} of the intrinsic base layer 
As { TAIL ~ a consequence } of the masking , the second portion of the intrinsic base layer is thinner than { HEAD ~ the first portion } of the intrinsic base layer
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH