知乎，让每一次点击都充满意义 —�?欢迎来到知乎，发现问题背后的世界。 Elements A and B do not change the orientation on the bilayer (apart from doable rotation by a hundred and twenty°, which does not change the lattice and is particularly disregarded hereafter); the only real difference between A and B is change of your lattice. Element C, nevertheless, https://remingtonzyxih.wizzardsblog.com/35771129/the-smart-trick-of-colour-of-manganese-dioxide-that-nobody-is-discussing