Dear QE experts, I am doing slab calculations, and have let the interlayer spacings change along z-direction. I sometimes encounter the message: "the symmetry opetarion #... is not...", and sometimes this problem causes the program stop. However, I followed Eyvaz's suggestion in the forum and added "nosym=.true." in &SYSTEM. Now there is no complain about symmetry operation but the number of k-points has been increased. My question is: using "nosym=.true.", what symmetry operations are ignored, and where should I refer to find out which symmetry operation number refers to what? Best regards, Mahmoud Payami,
Physics Group, AEOI, Tehran, Iran.
