The contact is made by etching the film with an acidic solution and thereafter treating {HEAD ~ the etched surface} with {TAIL ~ an alkaline solution} 
with
The contact is made by etching the film with an acidic solution and thereafter treating { HEAD ~ the etched surface } with { TAIL ~ an alkaline solution }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL