In yet another aspect of the invention, a method comprises forming a first macro having a metal wiring layer on a first level electrically connected to a metal wiring layer on a second layer and a capping layer over {HEAD ~ the metal wiring layer} on {TAIL ~ the second layer} which has a first electromigration resistance 
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In yet another aspect of the invention , a method comprises forming a first macro having a metal wiring layer on a first level electrically connected to a metal wiring layer on a second layer and a capping layer over { HEAD ~ the metal wiring layer } on { TAIL ~ the second layer } which has a first electromigration resistance
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