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