The method 13, wherein a number of masking steps used for forming the crossbar array is independent of a number of {HEAD ~ metal and insulator layers} of {TAIL ~ the crossbar array} 
of
The method 13 , wherein a number of masking steps used for forming the crossbar array is independent of a number of { HEAD ~ metal and insulator layers } of { TAIL ~ the crossbar array }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL