.. kiessig_calculator_help.rst

.. This is a port of the original SasView html help file to ReSTructured text
.. by S King, ISIS, during SasView CodeCamp-III in Feb 2015.

Kiessig Thickness Calculator Tool
=================================

Description
-----------

This tool is to approximately estimate the thickness of a layer or the 
diameter of particles from the Kiessig fringe in SAS/NR data, and using the 
Kiessig relation

thickness = 2*Pi/fringe_width.
  
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How To
------

To get a rough thickness or particle size, just type the Kiessig fringe width 
(in units of 1/Angstrom) and click on the 'Compute' button. Then the output 
value will be show up in the 'Thickness' text box.