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We report the results of an experimental study of the magnetoresistance$\rho_{xx}$ in two samples of $p$-Si/SiGe/Si with low carrier concentrations$p$=8.2$\times10^{10}$ cm$^{-2}$ and $p$=2$\times10^{11}$ cm$^{-2}$. Theresearch was performed in the temperature range of 0.3-2 K in the magneticfields of up to 18 T, parallel to the two-dimensional (2D) channel plane at twoorientations of the in-plane magnetic field $B_{\parallel}$ against the current$I$: $B_{\parallel} \perp I$ and $B_{\parallel} \parallel I$. In the samplewith the lowest density in the magnetic field range of 0-7.2 T the temperaturedependence of $\rho_{xx}$ demonstrates the metallic characteristics ($d\rho_{xx}/dT>$0). However, at $B_{\parallel}$ =7.2 T the derivative $d\rho_{xx}/dT$ reverses the sign. Moreover, the resistance depends on thecurrent orientation with respect to the in-plane magnetic field. At$B_{\parallel} \cong$ 13 T there is a transition from the dependence$\ln(\Delta\rho_{xx} / \rho_{0})\propto B_{\parallel}^2$ to the dependence$\ln(\Delta\rho_{xx} / \rho_{0})\propto B_{\parallel}$. The observed effectscan be explained by the influence of the in-plane magnetic field on the orbitalmotion of the charge carriers in the quasi-2D system.

Large Magnetoresistance of a Dilute $p$-Si/SiGe/Si Quantum Well in a Parallel Magnetic Field