The single crystals of layered transition metal dichalcogeaides MoSe2 and WSe2 have been grown using the ”oscillating chemical vapor transport method”. The Debye Wailer factors of the crystals were determined using 001 and h00 reflections for 4 ≦ 1 ≦ 20 and 1 ≦ h ≦ 5 at room temperature.