Multiferroicity driven by single-atom adsorption on the two-dimensional semiconductor ScCl3

K@ScCl 3 exhibits out-of-plane ferroelectric and ferromagnetic properties. Its 2D polarization is ∼4.65 pC m −1 with a transition barrier of 57 meV per f.u. Monte Carlo simulations suggest a Curie temperature of ∼37 K.