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