Suppose \\(A\\) is 3-by-2:

\\[
\begin{bmatrix}
1 & 2 \\\\
3 & 4 \\\\
5 & 6
\end{bmatrix}
\\]

And \\(B\\) is 2-by-4:

\\[
\begin{bmatrix}
10 & 20 & 30 & 40 \\\\
50 & 60 & 70 & 80
\end{bmatrix}
\\]