450] with the special condition that incident rays are orthogonal to the plane of incidence.

Now in the special case when the rays are polarized at right angles to the plane of incidence and strike the bounding surface at the angle of polarization, p = 0, and p' = 0.

For consideration of the reflection process on the Poincare sphere, represent the light with respect to Cartesian coordinates with the X and Y axes in and normal to the plane of incidence and the Z axis in the direction of propagation.

By eq (6) this corresponds to zero ellipticity, [chi], and azimuth [varphi] so it represents the orientation of the X axis, or the plane of incidence.

If the TEM field distribution in a coaxial line is examined, the vector E can be observed to be at any angle to the

plane of incidence.

tot,s] are the amplitude reflection coefficients parallel and perpendicular to the

plane of incidence, respectively, and [[theta].

The geometry of this half space case in the plane of incidence (defined by [phi]) with angle of incidence [theta], is shown in Figure 3.

In this first half-space problem case, we consider the plane of incidence to be the y-z plane ([phi] = 90[degrees]).

Ellipsometers divide polarized light into two components, one parallel to, the other perpendicular to, the

plane of incidence.

Since a disk has rotational symmetry with respect to z-axis, we can assume without loss of generality that the

plane of incidence lies in xz-plane ([[phi].

The incident vector and the normal vector at the intersection point on the inner surface define the

plane of incidence.

1, [theta] is the polar angle between the Z-axis and the incident wave-vector, [phi] is the azimuth angle between the X-axis and the

plane of incidence, and [lambda] is the wavelength in vacuum.