Specific gravity 0.8kg/m3 during the flow of a fluid, which is 1 cm Decoupled between them since the velocities in the found layers are U1=2 cm/s and U2=3 cm/s, respectively, this is N/m2 of the shear stress in the region determine the value in terms of. ( Oil=0.8kg/m3 ; =1x10-4 m2 /s)