A contact region between {HEAD ~ the via} and {TAIL ~ the section} of the metal layer may define a crossbar array 
A contact region between { HEAD ~ the via } and { TAIL ~ the section } of the metal layer may define a crossbar array
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH