Before irradiation or heating, {TAIL ~ the silver film} provides {HEAD ~ a low resistance electrical connection} between the two conductors 
Before irradiation or heating , { TAIL ~ the silver film } provides { HEAD ~ a low resistance electrical connection } between the two conductors
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH