Solving for inset depth (y_0) from the edge:
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<div class="input-group"> <label>⚡ Edge resistance, R_edge (Ω)</label> <input type="number" id="redge" placeholder="e.g., 200" value="200"> <div class="hint">Typical range: 150–250 Ω (depends on width & substrate)</div> </div>
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