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