Since we're computing a Radar Cross Section, we also need to add a planewave source. For this example, we will specify a TMz planewave with k = sqrt(2)/2 x - sqrt(2)/2 z, or theta = 135 degrees, phi = 0 degrees.
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[[Image:Large struct article mesh detail.pngâ|thumb|left|150px|Figure 1: Geometry of the periodic unit cell of the dispersive water slab in EM.Tempo.]]
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[[Image:Large struct article mesh settings.png ââ|thumb|left|150px|Figure 1: Geometry of the periodic unit cell of the dispersive water slab in EM.Tempo.]]
For the mesh, we use the "Fast Run/Low Memory Settings" preset. This will set the minimum mesh rate at 15 cells per lambda, and permits grid adaptation only where necessary. This preset provides slightly less accuracy than the "High Precision Mesh Settings" preset, but results in smaller meshes, and therefore shorter run times.