The solid phase conduction/reaction algorithm does not have an explicit transport mechanism for pyrolyzed gases. Rather, the pyrolyzates are assumed to appear instantaneously at the surface. Which surface is controlled by the \ct{SURF} line parameter \ct{LAYER_DIVIDE}, a real number that specifies the number of layers whose gaseous pyrolyzates are to be applied to the surface with the given \ct{SURF} label. For example, if \ct{LAYER_DIVIDE=1.5}, the gases generated by the first layer and half of the second layer shall be applied at the given surface. This same partitioning holds whether or not the solid is shrinking or swelling. Be careful to ensure that the specified values of \ct{LAYER_DIVIDE} are consistent for the \ct{SURF} lines that control opposing surfaces. If two different \ct{SURF} lines govern the front and back of a solid obstruction, the specified values of \ct{LAYER_DIVIDE} should sum to the total number of layers. Otherwise, the mass of evolved gases may not be correct.
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