A portion of {HEAD ~ the conductive spacer layer} is removed to leave {TAIL ~ a conductive spacer} within the opening 
A portion of { HEAD ~ the conductive spacer layer } is removed to leave { TAIL ~ a conductive spacer } within the opening
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH