Single Sided
When this checkbox is ticked, Maxwell Render will disregard the volume of your object and consider it a hollow polygon surface with a virtual thickness. The aforementioned SSS parameters are also valid in this new mode. The value sets the virtual thickness of your surface in mm. You can also use a thickness map for more complicated effects.
Min/Max
These values define the minimum and maximum virtual thickness and are only available when a thickness map is used. The thickness map will be treated as a grayscale map using this given range. When this checkbox is ticked, Maxwell Render will disregard the volume of your object.