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Real-time grazing incidence diffraction (GIXD) during evaporation of DIP onto sapphire; substrate temperature 130 °C, rate ~3 Å/min, time resolution ~1minute. In plane-Bragg reflections (along q║) can be seen to develop already for the first monolayer of DIP; note the shift due to changes in the unit cell. Along q┴ crystal truncation rods with higher order Bragg reflections appear for increasing coverage. q║ q┴ DIP molecule Scattering geometry for GID