SURFACE MAGNETIC FIELDS STRENGTHS OF 2 10 G HAVE BEEN MEASURED FROM THE EVOLVED STARS X CYG AND U MON. THESE MEASUREMENTS SUPPORT THE NOTION THAT LARGE SCALE MAGNETIC FIELDS THREAD THE CIRCUMSTELLAR ENVIRONMENT OF ASYMPTOTIC GIANT BRANCH AGB AND POST AGB STARS. MAGNETIC FIELDS ARE POSSIBLE TRIGGERS OF THE SUPERWIND PHASE OF AGB STARS AND ASYMMETRIC SHAPING OF MASS LOSS INTO THE POST AGB PHASE. THE LOW SURFACE MAGNETIC FIELD STRENGTHS IMPLY X RAY FLUXES THAT ARE WITHIN REACH OF DEEP XMM EXPOSURES. WE PROPOSE XMM X RAY OBSERVATIONS OF THESE TWO EVOLVED STARS TO DETECT THEIR PREDICTED LOW LEVEL X RAY EMISSION AND ESTABLISH A CORONAL ORIGIN FOR ANY X RAY EMISSION. ULTIMATELY THESE OBSERVATIONS PROVIDE INSIGHT INTO THE EVOLUTION OF STELLAR MAGNETIC PROCESSES.