Table S1 Properties of SnTiO

Fig.S5 Enthalpies of formation of SnO(SnTiO₃)_n and SrO(SrTiO₃)_n as a function of n.

Figure S6 energy difference per formula unit per n of the ferroelectric state under biaxial strain (on a LaAlO₃ substrate) with respect to the corresponding nonpolar state. n=∞ corresponds to bulk SnTiO₃.