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