Where only the coating material is coated on an area of a substrate, {HEAD ~ the thickness profile} is taken as the thickness of {TAIL ~ the coating material} alone 
Where only the coating material is coated on an area of a substrate , { HEAD ~ the thickness profile } is taken as the thickness of { TAIL ~ the coating material } alone
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 OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH