a second phase changing {HEAD ~ layer} arranged between the second voltage application electrode and {TAIL ~ the second opposing electrode} 
arranged between
a second phase changing { HEAD ~ layer } arranged between the second voltage application electrode and { TAIL ~ the second opposing electrode }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL