{HEAD ~ At least a portion} of {TAIL ~ the first surface} or second surface is coated with a first coating material 
{ HEAD ~ At least a portion } of { TAIL ~ the first surface } or second surface is coated with a first coating material
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH