The resonance muonic molecular formation is highly dependent on the energy of muonic atoms. The energy loss of muonic atoms depends on the range of distance traveled in a medium. The resonance molecular formation rate for dt is maximum if the kinetic energy of the muonic atoms (such as t) which enter the D2 medium is in the range of 0.4- 0.6 eV. In this research, the transport theory is used to study the effect of thickness of the suggested multi-layer system (H/T and D2) on the output kinetic energy of the muonic atoms, t. The optimum thickness of multi-layer system is also calculated for dt resonance formation. Finally, the obtained results of the used theoretical method are compared with the experimental results. It is shown that the used transport theory is a good and acceptable theory for studying the transport of muonic atoms in hydrogen isotope media.