Insulating {HEAD ~ single or double layer} 404 is then etched to expose {TAIL ~ contact areas} 408, leaving the structure of FIG 4D 
is etched to expose
Insulating { HEAD ~ single or double layer } 404 is then etched to expose { TAIL ~ contact areas } 408 , leaving the structure of FIG 4D
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH