  Solvothermal intercalation of ethylenediamine molecules into FeSe separates
the layers by 1078 pm and creates a different stacking. FeSe(en)0.3 is not
superconducting although each layer exhibits the stripe-type crystal structure
and the Fermi surface topology of superconducting FeSe. FeSe(en)0.3 requires
electron-doping for high-Tc similar to monolayers of FeSe@SrTiO3, whose much
higher Tc may arise from the proximity of the oxide surface.
