Two matrices combination problem

Hi， I was wondering how to combine the following two matrices like this？and what is it is two big matrices?

Answer 1

[José-Luis]

 A = ones(2);
 B =  reshape(1:9,3,3)';

 C = zeros(size(A,1) + size(B,1));
 C(1:2:end,1:2:end) = B;
 C(2:2:end,2:2:end) = A;