Converting MAT 8 to MAT 9

Hello all:

I am designing a sandwich door for the A350 as part of my master thesis. I have completed the 2D modeling with MAT8 material card and PCOMP property card.

For MAT 9, there is no option for giving in the youngs modulus, Gij is the property matrix it says but fails to clarify which is the youngs modulus and shear modulus. Only thing I can understand is the poisson ratios. Could you clarify this a further please and aid me in the conversion.

Thank you
Sim