4

C       0.139185228201823      0.021653142467204      0.150506424564468
C       1.350201103927561      1.212908307945929     -0.243636787338550
Si      1.389794971929593      0.002399151070075      1.384042182699378
Si      0.235203215896056      1.744219625025656      1.591769158335522