Kronecker Product

$$\mathbf{A}\otimes \mathbf{B}=\left[\begin{array}{ccc}{a}_{11}\mathbf{B}& \dots & a_{1n}\mathbf{B}\\ ⋮& \ddots & ⋮\\ a_{m1}\mathbf{B}& \dots & a_{mn}\mathbf{B}\end{array}\right]$$

• $\mathbf{A}$ is an $m\times n$ matrix
• $\mathbf{B}$ is a $p\times q$ matrix
• The entire matrix is overall $pm\times qn$