Even though Goldschmidt tolerance components can semi-quantitatively predict structural distortion on the basis of steric hindrance in 3D perovskites, It's not simple to use to 2D perovskites, because the layered segregated constructions in second perovskites enable the incorporation of more substantial natural and organic cations in to the inorganic cages26,27,28,29,thirty. https://crithitceramics.com/product/fireball/