ExperimentalConfiguration(material, fThickness)
  ExperimentalConfiguration(material, fThickness, fDelta, fTheta, fPhi)
 
  fThickness is in [m], angles are in rad.
 
  ExperimentalConfiguration(material, fThickness)
   use this call for nonbirefringent materials or in case when
   material orientation is defined with respect to a beam.
 
  ExperimentalConfiguration(material, fThickness, fDelta, fTheta, fPhi)
   fDelta fTheta fPhi are with respect to simulation axis
   use this if you know the absolut setting. (define crystal orientation)