Compositional heterogeneity in mixed nanocrystal superlattices led to unique angledependent collective resonances, unlocking a broad range of both far-field and near-field responses unachievable in single-component superlattices (Figure ). With simulations, the in-plane and out-of-plane resonances can be readily separated and the spectral contributions of each particle to extinction and near field enhancement (NFE) isolated. For example, the simulation results revealed that, in a mixed monolayer of 1% Sn and 3% Sn ITO nanocrystals at varying mixing ratios, the low-doped (high-doped) particles primarily contribute to the in-plane (out-of-plane) resonance (Figure ). Understanding the resonance contributions on a per-particle basis is crucial because NFE is spatially heterogeneous and more intense around the stronger resonators.