Besides, multiple reflection sharp peaks (Fig. ) within the same range of absorption coefficient peaks are detected in both directions. The maximum reflectivity is 10% (7.95 eV) and 40% (12.29 eV) for in-plane and out-plane direction which is higher than h-BN. The abrupt rise of reflectivity at 12.29 eV in out-of-plane direction is connected to the plasma frequency and the corresponding metallicity. The loss of oscillatory reflectivity curve beyond 20 eV indicates the monolayer's transparency region.