removing the dielectric layer in the area of {HEAD ~ the opening} of {TAIL ~ the mask} to obtain the recess 
removing the dielectric layer in the area of { HEAD ~ the opening } of { TAIL ~ the mask } to obtain the recess
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH