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