{HEAD ~ The second interconnect structure} is formed with a second interfacial structure different from the first interfacial structure of {TAIL ~ the first interconnect structure} 
{ HEAD ~ The second interconnect structure } is formed with a second interfacial structure different from the first interfacial structure of { TAIL ~ the first interconnect structure }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL