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Quite recently, the Belle Collaboration has reported the first measurement of the $D^*$ longitudinal polarization fraction in the $B \\to D^* \\tau \\bar\\nu$ decay. Motivated by this intriguing result, together with the recent measurements of $R_{J/\\psi}$ and $\\tau$ polarization, we study $b \\to c \\tau \\bar\\nu$ decays in the Supersymmetry (SUSY) with $R$-parity violation (RPV). 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