4

Si      0.297684540097517     -0.017263093336998     -0.139343332569972
Si      1.670896112097038      1.470111238811570     -0.297796817751224
Si      1.217558855707376     -0.144585691647589      1.399171481548388
Si      0.262353385949982      1.348380964788726      1.710053546513952