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The conduction-electron g factor has been calculated at points on the Fermi surfaces of copper, silver, and gold by a relativistic linearized muffin-tin orbital method in the atomic-sphere approximation. The orbital g factors for principal extremal orbits on the Fermi surface of each metal have been deduced. A comparison with experimental g-factor «fata makes it possible to estimate the exchange-correlation enhancement factor for electrons on the Fermi surface of copper. The Fermisurface average of the enhancement factor is in agreement with the predictions of a first-principles calculation, and the data suggest a weak anisotropy. Experimental data for silver and gold prove to be insufFiciently accurate to yield reliable values of the exchange-correlation enhancement factor. A g-factor anomaly on the neck orbit in gold is discussed.

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The corrosion protection of stainless steel (SS 316L) provided by layers of SiO 2 and by siloxane-anchored self-assembled monolayer (SAMs) was assessed by cyclic voltammetry (CV) and by potentiostatic current transient in sodium chloride media. The SAMs were composed of octadecyltrimethoxysilane anchored onto a thin (1-2 nm) layer of SiO 2 . The initial SiO 2 layer was obtained by treatment with tetraethoxyorthosilicate. Successive layers were added by applying the alkylsiloxane and then oxidatively removed by treatment using a UV-ozone cleaner. Though SAMs have been used as corrosion barriers in other contexts, it is shown that successive cycles of SAM deposition and ablation provide an extended SiO 2 thincovering layer that protects stainless steel against pitting and general corrosion.