Polarization-Tunable Photoelectrochemistry at Individual Anisotropic ReS ₂ and Its Homostructure Interfaces

layers with controlled twist angles and thickness contrasts, we achieve programmable junction behavior ranging from nearly isotropic responses in 90°-twisted bilayers to layer-dominant anisotropy dictated by photogeneration balance. For arbitrary twist angles, the phase shifts of the individual layers add coherently, enabling predictive control of the angular response. This work establishes light polarization as a precise and versatile control knob for nanoscale photoelectrochemistry, offering a new paradigm for designing optoelectronic and photocatalytic devices with intrinsic polarization selectivity.