# 📐 L2 Spec — Scanning Electron Microscopy (SEM) — secondary-electron surface imaging Mismatch-Only Spec
**ID:** `L2-084-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-084`](/artifact/l1/L1-084)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554186
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 512 – 8192 |
| W | px | 512 – 8192 |
| Kv | — | 1 – 30 |
| Spot nm | nm | 0.5 – 10 |
| Pixel nm | nm | 0.5 – 100 |
| Beam drift | — | 0.0 – 2.0 |
| Beam damage | — | 0.0 – 0.5 |
| Peak electrons | — | 10 – 10000 |
| Charging artifact | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
22.0 + 2.0 * log10(peak_electrons / 10) - 2.0 * beam_drift - 10.0 * charging_artifact
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`5aa828be04001a74ecc0372f11a604d9d3967c8d83c9310aa44259d63b81edeb`
## 5. On-chain Registration
- **Chain hash:** `0x5be35e3b60e84ed2439965e2883033fc33cb1b8ae12cfded48458e6914fcd3d5`
- **Chain tx hash:** `0x9069251fd88a84b2e7966bdcaa529d5ce8a16a04473e8bf020d7b6882b99c5ca`
- **Chain block:** `41554186`
---
## File Mapping
This bundle consists of: `L2-084-001.md`, `L2-084-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-084-001.md` | Source of truth — edit this | Human or LLM |
| `L2-084-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-084-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._