Analytic and exact form is derived for the propagation matrix to describe e
lectromagnetic waves propagation, reflection and transmission properties of
isotropic chiral slabs and multi-layers. Using this form a faster speed of
the calculation is demonstrated. The enhancement of chiral reflection in a
Fabry-Perot configuration is presented. We found a controversy with the ex
isting expression derived by Schmidt and Eidner (Optik 84, (1990) 43-46) as
well as part of their numerical results which is attributed to some errors
in their solution.