# Layer Depth

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**Layer Depth** (also referred to as **Layer Thickness**) is the dry-film thickness of one individual layer within a multi-layer coating system, in micrometres (µm), as resolved by the [Boring Thickness Module](rhopoint-appearance-elements-using-aesthetix-with-ae-aesthetix-modules-boring-thickness-module.md).

### Definition

In a Säberg-drilled crater imaged by Aesthetix, each layer interface appears as a circular ring. Layer Depth is the thickness of the coating material between two adjacent rings, calculated as:

> **Layer Depth [µm]** = | r_outer − r_inner | × tan(Drill Angle) × mm/pixel × 1000

with `r_outer` and `r_inner` the radii of the two rings bounding the layer in image pixels, [Drill Angle](glossary-of-measurement-parameters-drill-angle.md) the cone angle of the drill bit, and mm/pixel the calibrated pixel scale of the Aesthetix Aspec camera.

### Layer Numbering

Layers are numbered from the **outside in** of the crater, which corresponds to the **top down** of the original coating stack:

- **Layer 1 Depth** — outermost (top) layer, typically the topcoat / clearcoat
- **Layer 2 Depth** — next layer down, typically the basecoat
- **Layer 3 Depth** — next layer down, typically the primer
- **Layer 4–5 Depth** — additional sub-layers if present

With **N** detected rings the module produces **N − 1** layer depths. The data table stores up to five layers (Layer 1 Depth … Layer 5 Depth).

### Units

Always reported in micrometres (µm), formatted with two decimal places.

### In Appearance Elements

- **Columns:** Layer 1 Depth, Layer 2 Depth, Layer 3 Depth, Layer 4 Depth, Layer 5 Depth in the Boring Thickness data table
- **Detail view:** A per-layer thickness data grid is shown in the expanded result panel of any Boring Thickness measurement.

See also: [Drill Angle](glossary-of-measurement-parameters-drill-angle.md), [Total Depth](glossary-of-measurement-parameters-total-depth.md), [Boring Thickness Parameters](rhopoint-appearance-elements-using-aesthetix-with-ae-aesthetix-modules-boring-thickness-module-boring-thickness-parameters.md).