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