removing {HEAD ~ said first insulating layer} thereby exposing the outer walls of {TAIL ~ said first conductive material} 
removing { HEAD ~ said first insulating layer } thereby exposing the outer walls of { TAIL ~ said first conductive material }
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL