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The two-dimensional tunable self-assembly of particles adsorbed at fluidic interfaces has garnered significant interest thanks to its wide range of applications. The capillary attraction potential driven by interfacial distortions enables the programmable assembly of both meso- and micro-scale particles. In this work, we present experiments that guide the tunable interfacial assembly of microparticles trapped at the fluidic interface between water and a dense oil. We fabricated disc-shaped microparticles of varying sizes and hydrophobicity and observed two distinct regimes of the corresponding interfacial self-assembly behavior. Our results demonstrate that wettability-induced tunable self-assembly can be realized in disc-shaped microparticles when their lateral dimensions exceed a critical size threshold. These insights are crucial for designing particle systems that utilize lateral capillarity for controlled material 2D assembly at fluidic interfaces.