Title: On Randers metrics of isotropic S-curvature II
Abstract: We have classified all Randers metrics of isotropic S-curvature when their Riemann metrics from navigation problem are locally conformally flat.In this paper, we study Randers metrics of isotropic S-curvature and constant S-curvature on product manifolds by navigation method, in which the corresponding Riemann product metrics from navigation problem are generally not locally conformally flat.