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