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We present results on the leveling of polymer microdroplets on thin filmsprepared from the same material. In particular, we explore the crossover from adroplet spreading on an infinitesimally thin film (Tanner's law regime) to thatof a droplet leveling on a film thicker than the droplet itself. In bothregimes, the droplet's excess surface area decreases towards the equilibriumconfiguration of a flat liquid film, but with a different power law in time.Additionally, the characteristic leveling time depends on molecular properties,the size of the droplet, and the thickness of the underlying film. Flow withinthe film makes this system fundamentally different from a droplet spreading ona solid surface. We thus develop a theoretical model based on thin filmhydrodynamics that quantitatively describes the observed crossover between thetwo leveling regimes.

Beyond Tanner's Law: Crossover between Spreading Regimes of a Viscous Droplet on an Identical Film