{HEAD ~ The second macro} is formed with {TAIL ~ a metal wiring layer} on the first level electrically connected to a metal wiring layer on the second layer with a same process flow of the first macro, and additionally includes forming a capping layer over the metal wiring layer on the second layer which has a second electromigration resistance different from the first electromigration resistance 
{ HEAD ~ The second macro } is formed with { TAIL ~ a metal wiring layer } on the first level electrically connected to a metal wiring layer on the second layer with a same process flow of the first macro , and additionally includes forming a capping layer over the metal wiring layer on the second layer which has a second electromigration resistance different from the first electromigration resistance
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH