What is the result of conductor skin effect?

As the frequency of an alternating current increases, the changing magnetic fields within the wire push the moving electrons toward the outer edges of the conductor. This phenomenon is universally known in electronics as the skin effect. Because the RF current is largely confined to a very thin, outer layer of the wire rather than utilizing its entire cross-section, the effective area carrying the current is drastically reduced. A smaller cross-sectional area directly results in a higher effective resistance for the conductor at those elevated frequencies. This is why thick solid wires are no better than hollow tubes at high RF frequencies, and why increasing temperature or electron mobility are not the primary culprits for this specific frequency-dependent resistance change.