At wavelength(energy) Å keV , and using
the detector other ... Pilatus 6M Eiger 9M Eiger 4M mar225, mx225HE mx300HE Quantum315 Quantum210 Jupiter210 R-AXIS IV, IV++, VII R-AXIS V Hamamatsu CMOS (radius= mm),

Resolution → Detector Distance

when you want to collect up to Å resolution,
you should set the detector distance to mm.

Detector Distance → Resolution

At the detector distance of mm from the sample,
the maximum resolution is Å.

Attenuation Rate → Thickness

At wavelength(energy) Å keV , to attenuate the intensity of X-ray by folds, set the Al Cu thickness to µm.

Thicknes → Attenuation Rate

At wavelength(energy) Å keV , and Al Cu thickness of µm, the X-ray intensity is attenuated by folds.

Å keV is .