A method and apparatus for forming layers on a substrate comprising depositing a metal seed layer on a substrate surface having apertures, depositing a transition metal layer over the copper seed layer, and depositing a bulk metal layer over the transition metal layer. Also a method and apparatus for forming a via through a dielectric to reveal metal at the base of the via, depositing a transition metal layer, and depositing a first metal layer on the transition metal layer. Additionally, a method and apparatus for depositing a transition metal layer on an exposed metal surface, and depositing a layer thereover selected from the group consisting of a capping layer and a low dielectric constant layer.

 
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