PDE Toolbox: c coefficient in 1D

I am trying to solve a system of 2 PDEs in 1D with PDE Toolbox. (Note that I have to use PDE Toolbox instead of pdepe since one of my PDEs is hyperbolic).

Here are my equations:

1. 
2. 

Written in the form that PDE Toolbox wants, we have

where [1 0; 0 0] is the matrix form of the c coefficient. The terms in brackets are matrices written in matlab form. Now, how can I write the c coefficient in the form expected by specifycoefficients()? I'm not sure how this translates into a tensor.