Furthermore a lattice strain (g in %) given in Table 1 implies that a distance of D in nm along a direction perpendicular to Bragg plane
results in a change in lattice spacing of this percentage.
<N> is the number of unit cells counted in a direction perpendicular to the (hkl) Bragg plane
, d is the spacing of the (hkl) planes.
 reduced the uncertainty to about 4.7 X [10.sup.-4] by following Scherm's suggestion to insert the sample with its surface parallel to the Bragg planes
of the interferometer.
Monomer is converted to polymer by exposure to a standing wave and this forces the droplets to align with the Bragg planes
. Different wavelengths can be selected by adjusting the angle of the interfering beams.