Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_headmodel_halfspace”.

  FT_HEADMODEL_HALFSPACE creates an EEG volume conduction model that
  is described with an infinite conductive halfspace. You can think
  of this as a plane with on one side a infinite mass of conductive
  material (e.g. water) and on the other side non-conductive material
  (e.g. air).
  Use as
     headmodel = ft_headmodel_halfspace(mesh, Pc, ...)
    mesh.pos = Nx3 vector specifying N points through which a plane is fitted 
    Pc       = 1x3 vector specifying the spatial position of a point lying in the conductive halfspace 
               (this determines the plane normal's direction)
  Additional optional arguments should be specified as key-value pairs and can include
    'sourcemodel'  = string, 'monopole' or 'dipole' (default = 'dipole')
    'conductivity' = number,  conductivity value of the conductive halfspace (default = 1)