How is this handeled? Shouldn't it be a must to specify a confined space? Or is everyting above the layer z=1 a relative permittivity of 1, in contrast to the rel. permittivity of 5 below the layer.
Also the following example is a mystery to me: Imagine to Boxes with different permittivity directly connected. (for example a layer of silicon and a layer of oxide directly connected) It is always stated in a D statement, that the inner and outer permittivity have a defined value. But now we have two D statements.
It makes sense to define an inner permittivity, since this is in a confined space. The specified outer permittivity of the silicon could collide with the outer permittivity of the oxide. Also the inner permittivity of the silicon can have a different value as the outer permittivity of the oxide.
If somebody could explain the topic to me I would be really happy.