A method of fabricating a structure including a low-k multilayered dielectric diffusion barrier layer having at least one low-k sublayer and at least one air barrier sublayer is described herein. The method includes applying a coating of a polymeric preceramic precursor, converting the polymeric preceramic precursor into a low-k sublayer, applying a coating of an air barrier sublayer and exposing the air barrier sublayer to a reactive plasma.

 
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