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