# Fourier-Robin brick¶

This brick can be used to add boundary conditions of Fourier-Robin type like:

for scalar problems, or

for linearized elasticity problems. `Q`

is a scalar field in the scalar case or
a matrix field in the vectorial case. This brick works for both real or complex
terms in scalar or vectorial problems.

The function adding this brick to a model is:

```
add_Fourier_Robin_brick(md, mim, varname, dataexpr, region);
```

where `dataexpr`

is the data of the model which represents the coefficient
. It can be an arbitrary valid expression of GWFL, the generic weak form language (except for the complex version for which it should be a data of the model)

Note that an additional right hand side can be added with a source term brick.