Referring to FIG. 1D, after deposition of the layer 7, an optional capping layer 12 may be deposited on the low k dielectric layer 7 by the plasma enhanced reaction of an organosilane or organosiloxane compound and an oxidizing gas such as N2O. Referring to FIG. 1E, after deposition of the capping layer, if any, the deposited layers are cured in a furnace or another chamber to drive off remaining