  We study the shock structure and the sub-shocks formation in a binary mixture
of rarefied polyatomic gases, considering the dissipation only due to the
dynamic pressure. We classify the regions depending on the concentration and
the Mach number for which there may exist the sub-shock in the profile of shock
structure in one or both constituents or not for prescribed values of the mass
ratio of the constituents and the ratios of the specific heats. We compare the
regions with the ones of the corresponding mixture of Eulerian gases and we
perform the numerical calculations of the shock structure for typical cases
previously classified and confirm whether sub-shocks emerge.
