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