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