Two-layer spin coating flow of Newtonian liquids: A computational study

•Numerical analysis of two-layer spin coating flow with capillary pressure effect.•Effect of model parameters and fluid properties on uniformity of film are studied.•Capillary ridges affect the uniformity of the final two-layer film.•A less viscous upper layer fluid results in a uniform two-layer film.•An equal amount of liquids in both the layers produces a uniform two-layer film.