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We study the kinetics of the isotropic-smectic phase transition in acolloidal rod/polymer mixture by visualizing individual smectic layers. First,we show that the bulk isotropic-smectic phase transition is preceded by asurface freezing transition in which a quasi two-dimensional smectic phase wetsthe isotropic-nematic interface. Next, we identify a two step kinetic pathwayfor the formation of a bulk smectic phase. In the first step a metastableisotropic-nematic interface is formed. This interface is wetted by the surfaceinduced smectic phase. In the subsequent step, smectic layers nucleate at thissurface phase and grow into the isotropic bulk phase.Comment: 5 pages, 4 figure, accepted by PR

Surface Freezing and a Two-Step Pathway of the Isotropic-Smectic Phase Transition in Colloidal Rods