patterning the layer of {TAIL ~ dielectric material} to expose at least one portion of the semiconductor substrate overlying {HEAD ~ the channel region} 
patterning the layer of { TAIL ~ dielectric material } to expose at least one portion of the semiconductor substrate overlying { HEAD ~ the channel region }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD