Heat transfer module: no surface-to-surface-radiation modelling found

Hello everybody,

I tried to set up a simple simulation (Comsol4.4) to estimate heat transfere in our experiment. Since some parts are cooled to low temperatures, it will be nessecary to implement surface-to-surface-radiation. I found some very interesting tutorials and up to this point it seemed to be rather easy.

Unfortunately I was not able to find the surfacce-to-surface-radiation component. Neither was there a seperate button in the "Select Physics" dialog (see picture) nor was any possibility in the "normal""heat transfer in solids (ht)" module.

So the big question is right now, where can I find and how can I implement.

Thanks to everybody, Markus!