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Using the light-cone QCD dipole formalism we investigate manifestations ofcolor transparency (CT) and coherence length (CL) effects in electroproductionof longitudinally (L) and transversally (T) polarized vector mesons. Motivatedby forthcoming data from the HERMES experiment we predict both the A and Q^2dependence of the L/T- ratios, for rho^0 mesons produced coherently andincoherently off nuclei. For an incoherent reaction the CT and CL effects addup and result in a monotonic A dependence of the L/T-ratio at different valuesof Q^2. On the contrary, for a coherent process the contraction of the CL withQ^2 causes an effect opposite to that of CT and we expect quite a nontrivial Adependence, especially at Q^2 >> m_V^2.Comment: Revtex 24 pages and 14 figure

Production of polarized vector mesons off nuclei