10 surface structure O 1.27982456 0.00000000 6.26955000 Si 2.08985000 1.33345000 5.45952414 O 2.89987632 0.00000000 4.64949828 O 0.81002632 1.33345000 4.17970000 Si 0.00000000 0.00000000 3.36967414 O 3.36967460 1.33345000 2.55964828 O 1.27982460 0.00000000 2.08985000 Si 2.08985000 1.33345000 1.27982414 O 2.89987636 0.00000000 0.46979828 O 0.81002636 1.33345000 0.00000000