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   71028
   The hard X-ray emission region of magnetic cataclysmic variables is
   optically thick for the resonance scattering of iron K emission lines,
   although it is thin for the continuum emission. By means of a phase-
   resolved spectroscopy of the line and the continuum, we can constrain
   geometrical parameters of the emission region such as a height and a
   width. These parameters are important to investigate accretion geometry
   around Alfven radius, and also to fully understand the cooling process
   in the post shock accretion column. For this purpose, we propose a
   60ksec observation of V834 Cen.
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