wherein the coating material has {HEAD ~ a concentration} of {TAIL ~ the specific microstructural portion} which exceeds the required concentration, and 
of
wherein the coating material has { HEAD ~ a concentration } of { TAIL ~ the specific microstructural portion } which exceeds the required concentration , and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH