Changes
/* Multilayer Surface Models */
=== Multilayer Surface Models ===
[[File:PROP26.png|thumb|250px|Propagation Module's Penetrable Surface Dialog showing a three-layer wall composition]]
Most of the time, your outdoor propagation scene consists of simple buildings made of single-layer walls with standard material properties (ε<sub>r</sub> and σ). In the case of a single-layer impenetrable surface, the specular interface is an infinite dielectric half-space, which reflects the impinging rays. Single-layer penetrable surfaces, on the other hand, involve finite-thickness dielectric walls, which both reflect and transmit the incident rays. Similarly, most of your indoor propagation scenes involve simple single-layer penetrable walls with the specified material properties ε<sub>r</sub> and σ. A thin wall acts like a finite-thickness dielectric slab that both reflects and transmits incident rays. In the case of the global ground or terrain objects, only ray reflection off the ground surface is considered.
You can also search EM.Cube's material database by clicking the '''Material''' button of "Add Layer" or "Edit Layer" dialogs. This opens the '''Materials''' Dialog. Inside the material list select and highlight any row and click the '''OK''' button. The selected material will fill out all the fields in the "Add Layer" or "Edit Layer" dialogs. Inside the Materials Dialog, you can type the few first letters of any material, and it will take you to the corresponding row of the list.
[[File:PROP24.png]]
Figure 2: EM.Cube's material list.
=== Transferring Objects From Or To Other Modules ===
