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