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Reinforced composites with controlled microstructure can achieve exceptional mechanical and functional properties. In recent years, scientists have placed in substantial efforts to fabricate reinforced composites with astounding properties through the design of these microstructures. To better understand the structure-property relationships of these materials, it is essential to characterise their microstructural features. However, standard characterisation techniques such as electron-based imaging are costly, time-consuming, and restricted to small-scale samples. In this work, we present a simple, inexpensive, and high-throughput alternative method to assess the surface microstructure of microplatelet reinforced composites. The method relies on directional reflectance microscopy (DRM), an optical technique that enables mapping of the filler orientation and weight fraction in these composites using surface reflectance …