{TAIL ~ The difference} in the contact potential measured before and after {HEAD ~ heating} provides an indication of the mobile ion concentration in the oxide layer 
{ TAIL ~ The difference } in the contact potential measured before and after { HEAD ~ heating } provides an indication of the mobile ion concentration in the oxide layer
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH