Hi, please help

and i need to know how can i calculate Qbar for isotropic material

Questions A sandwich plate has the dimension shown below. Each 0.125 mm thick ply has the properties given in the table below., with the fibers oriented as indicated in the picture. The isotropic foam core has the following elastic properties: E = 1 GPa, v = 0.3. Calculate the A, B = and D matrices. Table 1. Properties of fibers E11 (GPa) 38.0 E22 (GPa) 8.0 G12 (GPa) 4.2 V12 0.25 25 0.25 mm 12 mm 0.25 mm