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