On a multidimentional Brownian motion with partly reflecting membrane on a hyperplane

A multidimensional Brownian motion with partial reflection on a hyperplane $S$ in the direction $qN+\alpha$, where $N$ is the conormal vector to the hyperplane and $q\in [-1,1], \alpha \in S$ are given parametres, is constructed and this construction is based on both analytic and probabilistic approaches. The joint distribution of $d-$dimensional analogy to skew Brownian motion and its local time on the hyperplane is obtained.