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