A hole may be formed in the trench and contact {HEAD ~ a section} of {TAIL ~ the metal layer} 
of
A hole may be formed in the trench and contact { HEAD ~ a section } of { TAIL ~ the metal layer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL