Layout: 
` 1 2 3 4 5 6 7 8 9 0 - = BKSP
TAB
CapsL ENT
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US Phonemic

Layout for typing in American English (GA) with IPA symbols.
The Unshifted and Shifted layers (Layers 1 & 2) are compatible with Shavian QWERTY layout.
Layers 3 & 4 contain additional IPA symbols, punctuation marks, hyphens, etc., that may also be very useful.

a b c d e f g h i j k l m n o p q r s t u v w x y z
ə b d ɛ f ɡ h ɪ j k l m n ɒ p ɔɪ r s t ʌ v w ɜr ɑ z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
æ ɪər ər · ð i « » u ŋ ɔʊ ɔr ɑr ʃ θ ʊ ju ɪə ɛr ɔ ʒ

Differences between US and UK notations:

UK (RP)UK (rhotic)US (GA)
ɑː ɑː ɑ
ɔː ɔː ɔ
u
i
ɑːʳɑːrɑr
ɔːʳɔːrɔr
ɜːʳɜːrɜr
əʊ əʊ ɔʊ
ʊəʳʊərʊr
eəʳeərer