4

C      -0.158746987965411      0.133725633654324     -0.292365283815303
C       1.421390439186226      1.289017536931626     -0.019931044502607
Si      1.411478232583233     -0.220009894603393      1.406868878249098
Si     -0.164039139447275      1.370104156094982      1.255717654185881