A certain ceramic has a theoretical density and sintered density of \( 6.76 \, \text{g/cm}^3 \) and \( 6.60 \, \text{g/cm}^3 \), respectively. The green compact has 18 volume percent porosity. For a sintered cube of side 2 cm, the required side of the cubic green compact in cm is \(\underline{\hspace{2cm}}\) (round off to 2 decimal places).