homogeneous layers of polymer (ESI Scheme S1). Focusing now on MnPS 3 @PEI, this composite gives a broad maximum in the histogram around 3.8 nm with no periodicity and a peak in the PXRD pattern corresponding to a new interlayer spacing of 1.14 nm. This points out to a smaller amount of polymer between the inorganic layers than in MnPS 3 @PVP. This discrepancy between PXRD and AFM results may be due to the formation of a few-layer material when deposited on substrates for AFM studies.