A thick insulator region is formed on a portion of {HEAD ~ the drift region} at {TAIL ~ the face} 
at
A thick insulator region is formed on a portion of { HEAD ~ the drift region } at { TAIL ~ the face }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL