Define the specially orthotropic laminate

Question

Response to the following problem:

Define and explain the following:

(a) Regular laminate,

(b) Balanced laminate, and

(c) Specially orthotropic laminate.

Demonstrate that an angle-ply laminate has A₁₆ = A₂₆ = 0 using an example laminate of your choice. In which case D₁₆ = 0? In which case D₁₆ ≠ 0?