61 IPC-A-600G July 2004 iii Table of Contents 3.1.5.1 3.1.5.2 3.1.6 3.1.7 3.1.8 3.1.9 Etchback ... 62 Negative Etchback ... 63 Smear Removal ... 64 Dielectric Material, Clearance, Metal Plane for Supported Holes ... 65 Layer-to-Layer Spacing ... 66 Resin Recession ... 67...