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  • // ************************************************************************** //
    //
    //  BornAgain: simulate and fit scattering at grazing incidence
    //
    //! @file      Core/Material/Material.h
    //! @brief     materials-related global functions and utilities
    //!
    //! @homepage  http://www.bornagainproject.org
    //! @license   GNU General Public License v3 or higher (see COPYING)
    //! @copyright Forschungszentrum Jülich GmbH 2015
    //! @authors   Scientific Computing Group at MLZ Garching
    //! @authors   C. Durniak, M. Ganeva, G. Pospelov, W. Van Herck, J. Wuttke
    //
    // ************************************************************************** //
    
    #ifndef MATERIALUTILS_H_
    #define MATERIALUTILS_H_
    
    #include "Complex.h"
    #include "Vectors3D.h"
    #include "EigenCore.h"
    
    //! Function for calculating the reduced potential, used for obtaining the Fresnel coefficients
    //! (non-polarized material case)
    complex_t ScalarReducedPotential(complex_t n, kvector_t k, double n_ref);
    
    #ifndef SWIG
    //! Function for calculating the reduced potential, used for obtaining the Fresnel coefficients
    //! (polarized material case)
    Eigen::Matrix2cd PolarizedReducedPotential(complex_t n, kvector_t b_field,
                                               kvector_t k, double n_ref);
    
    //! Utility to compute magnetization correction for reduced potential and scattering length density
    template <typename T>
    BA_CORE_API_ Eigen::Matrix2cd MagnetizationCorrection(complex_t unit_factor, double magnetic_factor,
                                                          BasicVector3D<T> polarization);
    
    #endif /* SWIG */
    
    #endif /* MATERIALUTILS_H_ */