ass="n">array</span><span class="p">([</span><span class="mi">0</span><span class="p">])</span>
<span class="n">d_SiO2</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="mf">2e-4</span><span class="p">])</span>
<span class="n">d_Ag</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="mf">1e-8</span><span class="p">])</sp