{TAIL ~ The conductive film} 9 functions as a switch for controlling {HEAD ~ the amount} of electrons emitted from the field emission tip 6 
{ TAIL ~ The conductive film } 9 functions as a switch for controlling { HEAD ~ the amount } of electrons emitted from the field emission tip 6
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH