Convert from X unit to alen [Swedish]

Unit Definition (X unit)
The X-unit (symbol xu) is a unit of length formerly used to measure the wavelength of X-rays and gamma rays. The X-unit is approximately 1.0021×10-13 metre. Defined by the Swedish physicist Karl Manne Georg Siegbahn (1886-1978) in 1925, the X-unit could not at that time be measured directly; the definition was instead made in terms of the spacing between planes of the calcite crystals used in the measuring apparatus.

Unit Definition (alen [Swedish])
The Swedish Alen is slightly shorter than the Scandinavian Alen. It is almost equal to 2 foot, or more precisely equal to 59.38 centimeters (23.38 inches).