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Applying the recently developed spin-charge gauge theory for the pseudogapphase in cuprates, we propose a self-consistent explanation of several peculiarfeatures of the far-infrared in-plane AC conductivity, including a broad peakas a function of frequency and significant anisotropy at low temperatures,along with a similar temperature-dependent in-plane anisotropy of DCconductivity in lightly doped cuprates. The anisotropy of the metal-insulatorcrossover scale is considered to be responsible for these phenomena. Theobtained results are in good agreement with experiments. An explicit proposalis made to further check the theory.Comment: 5 pages, 3 figures, to appear in Phys. Rev.

In-plane conductivity anisotropy in the underdoped cuprates using the spin-charge gauge approach