The work deals with neutron reflectivity measurements performed for di
fferent Ni films coated on different types of plexiglass substrates. T
he neutron reflectivity behaviours, deduced from experimental measurem
ents, were found to be similar; both for glass and plexiglass substrat
es. It is concluded that plexiglass can replace glass, as a substrate
for neutron mirrors. The quality of the mirror depends on both the Ni
coating and the type of plexiglass going to be used asa substrate. (C)
1998 Elsevier Science B.V. All rights reserved.