# 📐 L2 Spec — Reactive Molecular Dynamics (ReaxFF + Bond Order) Mismatch-Only Spec
**ID:** `L2-307-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-307`](/artifact/l1/L1-307)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554118
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Ff | — | ReaxFF_2008, ReaxFF_CHO, ReaxFF_metal |
| T k | — | 300 – 5000 |
| Dt fs | — | 0.05 – 0.5 |
| N atoms | — | 10 – 1000000.0 |
| N steps | — | 10000 – 1000000000.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.1 * (1 + 0.1 * mismatch_severity)
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |
## 4. Fingerprint
`8070ce047f3485634453e616d5bc33ba97c77dc8e390ac9644e813d7dcd8b796`
## 5. On-chain Registration
- **Chain hash:** `0x91f1d27bed45b0cf413aea92c2df13e2707b91e443cc12e95d6bd9d3da0423fb`
- **Chain tx hash:** `0x1f0213a7a20e439de9effd04f118533b614c9a3d4c051792d73c3fd637df22a8`
- **Chain block:** `41554118`
---
## File Mapping
This bundle consists of: `L2-307-001.md`, `L2-307-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-307-001.md` | Source of truth — edit this | Human or LLM |
| `L2-307-001.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 `L2-307-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._