n is an integer from 1 to 3, although it will be recognized that in {HEAD ~ a mixture} of {TAIL ~ functional alkoxy silanes} n may average from 1 to 3; and 
of
n is an integer from 1 to 3 , although it will be recognized that in { HEAD ~ a mixture } of { TAIL ~ functional alkoxy silanes } n may average from 1 to 3 ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH