Although the detailed nature of this fine spectral structure is beyond the scope of this work, the presence of these excited states shapes the complex photophysical landscape in this material that plays a key role in the strong light-matter coupling regime . in PEA₂PbI₄, which we observe in the absorption spectra (right, Figure ) and labeled as XA, XB and Xc . The energy dispersion of the microcavity agrees with the eigenstates of a