Substantially all of the functional coating is removed from a peripheral region of the first major surface while {HEAD ~ substantially all} of the functional coating is simultaneously removed from {TAIL ~ a peripheral region} of the second major surface 
is simultaneously removed from
Substantially all of the functional coating is removed from a peripheral region of the first major surface while { HEAD ~ substantially all } of the functional coating is simultaneously removed from { TAIL ~ a peripheral region } of the second major surface
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH