Absorbing layers

To enable or disable the use of absorbing layers use the following controls:

The 'No absorbing layers' button
	Disables the use of absorbing layers. This button provides a convenient way to remove the effects of the absorbing material layers in a simulation.

The 'Use absorbing layers' button
	Enables the use of absorbing layers. The layers can now be added, removed and edited via futher controls.

To add, remove and edit the absorbing layers use the following controls:

The layers table
	Use this table to select the absorbing layer to edit. When a layer is selected its properties are then shown in the layer density, thickness and thickness fluctuation fields. The layer material is displayed in the layer element composition table and the layer can be removed with the remove layer button.

The 'add layer' button
	This button adds an absorbing layer to the layers table. The layer will initially have thickness of 1 um, density of 1 g/cm and elemental composition of hydrogen. The layer can now be selected in the layers table and its properties edited.

The 'delete layer' button
	This button deletes the layer currently selected in the layers table. The deleted layer is then lost and won't be considered in the simulation.

The layer density field
	This field lets you specify the density of the material the currently selected layer is composed of.

The layer thickness field
	This field lets you specify the thickness of the currently selected layer.

The layer thickness fluctuations field
	This field lets you specify fluctuations in the thickness of the currently selected layer. The fluctuatioins are specified in absolute units.