Magnetic Co95Zr05/Al/Co95Zr05 tri-lagers structure have been deposited
on float glass and on Gd3Ga5O12. Polarised guided neutron waves in th
e Al layer are expected in such structures. Two different type of air
prism have been used for coupling the neutronwave to the waveguide. In
both structures the measured transmitted resonance are presented and
compared with the predicted one.