A passivation capping layer overlies the ohmic contact and has {HEAD ~ an oxidation rate} which is less than {TAIL ~ the oxidation rate} of the ohmic contact 
A passivation capping layer overlies the ohmic contact and has { HEAD ~ an oxidation rate } which is less than { TAIL ~ the oxidation rate } of the ohmic contact
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH