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