New plan

Preparation:
Read given 2 papers & Jens-Nielson for units-problem
Jens-Nielson & Klaus's Arbeit for Chapter I & II
Write:
Debye Series
Programming:
Implementation of loops in Mathematica

Regarding Debye Series:
some papers and van den Hulst and original Debye paper

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done for today:
Modification in IDL programme. S1(theta) & S2(theta) ranges over n(1->nstop) and “nang” belongs to “theta”. The array for S1 & S2 are limited for allowed number of angles, so should be array of “Mie”.
In Mathematica, all the initialization should be made, then S1 & S2 must be calculated, where they have Table form.