4

Si      0.212192530768357     -0.075146254061074      0.130732670595125
Si      1.282204502380368      1.782781973647627      0.308340974426585
Si      1.488617522664542     -0.062541994367114      1.425472804013258
Si      0.101331866998504      1.554734990173494      1.328949515622571